6L.J.Johnstion M.Ellis ect.Effect of Room Temperature and Dietary Animal Acid Concentration on Performance of Lactating Sows[J].Anim.Sci.,1999,77:1638-1644.
7N.Quninou,J.Noblet.Influence of High Anibient Temperature on performance of Multiparous Lactating Sows[J].Anim.sci.,1999 77:2124-2134.
8Heartsen,P.I.in Environmental.Aspects of Housing for Animal Production[J],London.1981:413.
9Greenberg,L.G.and J.P.Mahone,1982.Failure of a 16 h L =8hD or a 8hL = 16hD photoperiod to influence lactation or reproductive efficiency in sows.Can.[J].Anim.Sci.62:141-145.
10Hacker,R.R.and M.Perera.Effect of light changes on swine reproduction.University of Guelph[J].Annual Report.1981,21:21-23.
